Our office does an extreme amount of printing all day long from dusk till dawn. We ahve at least 5 HP printers/copiers in our office that we rely on. Our engineers depend on the copies coming out of the printer to be crisp and clean the first time. They do not have the time or energy or will to have to deal with changing out a bad cartridge or dealing with messy prints. Constantly our office depends on HP products including this HP 45A Black Toner Cartridge to outlast, outprint, and outperform on a daily basis.